@atomiqlabs/sdk-lib
Version:
Basic SDK functionality library for atomiq
68 lines (67 loc) • 2.81 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.maxSendable = exports.coinSelect = exports.DUST_THRESHOLDS = void 0;
const accumulative_1 = require("./accumulative");
const blackjack_1 = require("./blackjack");
const utils_1 = require("./utils");
Object.defineProperty(exports, "DUST_THRESHOLDS", { enumerable: true, get: function () { return utils_1.DUST_THRESHOLDS; } });
// order by descending value, minus the inputs approximate fee
function utxoScore(x, feeRate) {
let valueAfterFee = x.value - (feeRate * utils_1.utils.inputBytes(x));
if (x.cpfp != null && x.cpfp.txEffectiveFeeRate < feeRate)
valueAfterFee -= x.cpfp.txVsize * (feeRate - x.cpfp.txEffectiveFeeRate);
return valueAfterFee;
}
function coinSelect(utxos, outputs, feeRate, type) {
// order by descending value, minus the inputs approximate fee
utxos = utxos.sort((a, b) => {
// if(a.cpfp!=null && b.cpfp==null) return 1;
// if(a.cpfp==null && b.cpfp!=null) return -1;
return utxoScore(b, feeRate) - utxoScore(a, feeRate);
});
// attempt to use the blackjack strategy first (no change output)
const base = (0, blackjack_1.blackjack)(utxos, outputs, feeRate, type);
if (base.inputs)
return base;
// else, try the accumulative strategy
return (0, accumulative_1.accumulative)(utxos, outputs, feeRate, type);
}
exports.coinSelect = coinSelect;
function maxSendable(utxos, outputScript, outputType, feeRate) {
if (!isFinite(utils_1.utils.uintOrNaN(feeRate)))
return null;
let bytesAccum = utils_1.utils.transactionBytes([], [{ script: outputScript }], null);
let cpfpAddFee = 0;
let inAccum = 0;
const inputs = [];
for (let i = 0; i < utxos.length; ++i) {
const utxo = utxos[i];
const utxoBytes = utils_1.utils.inputBytes(utxo);
const utxoFee = feeRate * utxoBytes;
let cpfpFee = 0;
if (utxo.cpfp != null && utxo.cpfp.txEffectiveFeeRate < feeRate)
cpfpFee = utxo.cpfp.txVsize * (feeRate - utxo.cpfp.txEffectiveFeeRate);
const utxoValue = utils_1.utils.uintOrNaN(utxo.value);
// skip detrimental input
if (utxoFee + cpfpFee > utxo.value) {
continue;
}
bytesAccum += utxoBytes;
inAccum += utxoValue;
cpfpAddFee += cpfpFee;
inputs.push(utxo);
}
const fee = (feeRate * bytesAccum) + cpfpAddFee;
const outputValue = inAccum - fee;
const dustThreshold = utils_1.DUST_THRESHOLDS[outputType];
if (outputValue < dustThreshold)
return {
fee,
value: 0
};
return {
fee,
value: outputValue
};
}
exports.maxSendable = maxSendable;